Alexander Hacke (also known as Alexander von Borsig, Alex Hacke, Hacke, born 11 October 1965) is a guitarist, bass guitarist, singer, musician, record producer, writer and film maker from Germany. He is primarily known as a longtime member of the influential German industrial music group Einstürzende Neubauten.

In 1980, at the age of fifteen, he joined Einstürzende Neubauten, which had been formed earlier the same year. Hacke played guitar and worked with the band's sound until the mid 1990s. Then he changed from guitar to bass and is now a bass player and, according to band leader Blixa Bargeld, "a musical director of the band".

In 2003 Alexander Hacke and his longtime partner Danielle de Picciotto (married since 2006) organized the monthly event "BadaBing" in the famous Berlin 70s Club "Big Eden", presenting new and unusual bands and in this way initiating a new wave of Berlin-oriented "Futur-electroclash" music all over Europe. They travel extensively performing multimedia shows together and presenting workshops on Berlin underground culture. In 2004, Danielle de Picciotto produced a documentary on Einstürzende Neubauten for which Alexander Hacke did the sound design.

In 2005 Hacke and de Picciotto conceived and directed "The Mountains of Madness", an audio/visual live show based on stories by H. P. Lovecraft, inviting the English Trio The Tiger Lillies to participate and perform in the successful production throughout Europe.

Alexander Hacke's first noteworthy girlfriend was Christiane F., who became famous with the internationally acclaimed movie and book Wir Kinder vom Bahnhof Zoo, a biography of her heroin addiction. They performed together in Europe and the US with their band Sentimentale Jugend and also appeared together in the movie Decoder in 1983.

On 3 October 1989, Hacke's son Joshua was born in Berlin. His mother is Angela Mettbach, a Berlin nightlife figure who had a short-lived musical career with her band Octopussy.